Healthcare reform vote: Which Democrats are most vulnerable?

Washington – Remember Marjorie Margolies-Mezvinsky?

Anyone over a certain age who follows politics does. She was the first-term Democratic congresswoman from Pennsylvania who cast the decisive 218th House vote for President Clinton’s budget reconciliation bill in 1993 – and then went on to lose reelection in 1994.

Today, as the Democrats work to lock down just enough votes to pass an unpopular healthcare reform bill, “MMM” isn’t far from thought. No one wants to be the MMM of 2010. But there are several who could suffer that fate.

One obvious place to look is the 49 Democrats elected in 2008 from districts that voted for Republican John McCain for president...