The shrinking group of moderate House Democrats could get much smaller after the 2012 elections, when half of this once-influential group could be wiped out by energized Republican challengers and a fickle electorate.

The House Democratic Blue Dog Coalition saw its ranks decimated after the wave election of 2010, when voters in swing districts expressed their anger at the Democratic majority and White House by tossing out incumbent Democrats, including Allen Boyd of Florida, Lincoln Davis of Tennessee and Stephanie Herseth Sandlin of South Dakota.

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