OK, since they asked, here's the list of FORTY TWO Democrats who switched to Republicans in the 1960's and...?
This was when the "Southern Strategy" was being implemented, to take advantage of Southern outrage over civil rights being implemented by Democrats Kennedy and Johnson.
early 1960s – Arthur Ravenel, Jr. of South Carolina, before running for the South Carolina Senate
1960s – James F. Byrnes of South Carolina, after endorsing many Republicans in the 1950s and 1960s
1961 – Charlton Lyons to run for Louisiana's 4th congressional district seat
1961 - Billy J. Guin of Shreveport, to support Charlton Lyons for Congress
1962 - Dave Treen, later became U.S. Representative for Louisiana (1973-1980) and Governor of Louisiana (1980-1984)
1962 – Jack M. Cox, to run for Governor of Texas; losing to later Republican convert John B. Connally, Jr.
1962 – James D. Martin, to run for the U.S. Senate from Alabama
1962 – Ronald Reagan of California, while an actor and former Screen Actors Guild president 
1962 – Floyd Spence, while a South Carolina state Representative; ran for the House of Representatives as a Republican and lost, later elected to the state senate before making a successful run for the House
1964 – Strom Thurmond, while U.S. senator from South Carolina switched to the Republican party on September 16, 1964.
1965 – Albert Watson, while U.S. Representative from South Carolina (resigned before switching parties and re-won his seat in a special election)
1965 – Arlen Specter of Pennsylvania, while running for Philadelphia District Attorney; in 2009, he switched back to Democrat .
1965 – Roderick Miller (LA) after unsuccessfully run for judgeship in 1964
1966 – Thomas A. Wofford, before write-in campaign for State Senator from South Carolina
1966 – Len E. Blaylock, to support Winthrop Rockefeller for Governor of Arkansas
1966 – Jerry Thomasson of Arkansas, switched from Democrat to Republican while an state Representative to run for Attorney General of Arkansas
1966 – Henry Grover of Texas, switched from Democrat to Republican while a state Representative before successfully running for Texas Senate.
1967 – William E. Dannemeyer, while serving as a superior court judge before returning to the California State Assembly
1967 – Allison Kolb of Louisiana, while seeking a political comeback running unsuccessfully for state Treasurer, lost 1956 Democratic primary for state auditor
1968 – William Reynolds Archer, Jr., while a member of the Texas House of Representatives
1968 – Will Wilson, former Texas Attorney General switched to support Richard M. Nixon in the 1968 presidential election
1968 - Comptroller General of Georgia James L. Bentley switched to Republican.
1970 – Jesse Helms, two years before running for the U.S. Senate from North Carolina
1970 – A. C. Clemons, while serving in the Louisiana Senate
1970 – William Oswald Mills, before running for U.S. Representative from Maryland
1970 - Bob Barr, who later became U.S. Representative from Georgia (1995-2003).
1971 – Tillie K. Fowler
1972 – Robert R. Neall, before serving in the Maryland House of Delegates. He switched back to Democrat in 1999
1972 – Trent Lott, prior to running for the House of Representatives from Mississippi. He was administrative assistant to Rules Committee chairman William Colmer, who endorsed Lott as his successor despite Lott's party switch.
1973 – Mills E. Godwin Jr., Democratic governor of Virginia from 1966 to 1970, moved to the Republican Party and was reelected, serving as governor again from 1974 to 1978.
1973 – Samuel I. Hayakawa, three years before running for the U.S. Senate from California
1973 – John Connally, not then in office; six years before he sought the Republican presidential nomination
1975 – Elizabeth Dole, while employed by the Federal Trade Commission
1975 – John Jarman, while U.S. Representative from Oklahoma. He had served for 24 years in the House and said he was fed up with the Democratic party, which had been "taken over by liberals". He retired in 1976.
1977 – A. J. McNamara, while serving in the Louisiana House
1977 – Lane Carson while serving in the Louisiana House
1978 – Robert G. Jones, after leaving the Louisiana Senate
1978 – Chris Smith, managed the unsuccessful 1976 New Jersey Senate primary campaign of Democrat, Steve Foley, switch parties to run for U.S. Rep. in 1978 (lost)/ran again 1980 (Won) still holds office .
late 1970s – Thomas Bliley, after being Mayor of Richmond, Virginia, and before election to U.S. House of Representatives
late 1970s – Michael F. "Mike" Thompson, while serving in the Louisiana House
1979 – Charles Grisbaum, Jr., member of the Louisiana House from Jefferson Parish
1979 – Ed Scogin, member of the Louisiana House from St. Tammany Parish
From NAFTA/CAFTA to Glass Steagal repeals, which he proposed again and again!!!!
It happened in HUGE numbers at this time, and for a very specific reason!
REPUBLICANS WHO BECAME DEMOCRATS:
mid 1960s – Pete Stark, now U.S. Representative from California
1960s – Howard Dean, while in college
1960s – Archibald Carey, Jr, after serving as a Chicago alderman and before being elected as a circuit court judge in Cook County, Illinois
1962 – Calhoun Allen, to run for the Shreveport, Louisiana, City Council
1970s – Ralph Neas
1971 – John Lindsay, while mayor of New York City 
1971 – Leon Panetta, switched parties while not in or running for public office. He later became a U.S. representative from California (1976–93) and White House Chief of Staff (1994–1997).
1972 – Ogden R. Reid, while U.S. representative from New York
1973 – Joan Finney, before being elected Kansas State Treasurer, and later Governor of Kansas
1973 – Don Riegle, while