There is plenty of talk these days among political insiders about the prospects of a candidate switch in the race for United States Senate. This is New Jersey, so such specualtion is fair: Christine Todd Whitman dropped out of the race for U.S. Senate in 2000, followed by Robert Torricelli’s exit from the gubernatorial campaign just tweleve days after he got in. In 2001, Donald DiFrancesco dropped his bid for Governor — just after changing the law to move the primary back a few weeks to accommodate his withdrawal. James Treffinger was the front runner for the GOP U.S. Senate nomination in 2002 when federal prosecutors — Republican federal prosecutors — raided his office; he was gone in four days. Torricelli dropped out of the ’02 Senate race five weeks before Election Day. And in 2004, James E. McGreevey resigned after just 22 months in office.