Illinois Sen. Barack Obama's remarks about "bitter" small-town Pennsylvanians could make it more difficult for vulnerable House Democrats, many of whom remain uncommitted as superdelegates to the Democratic convention, to back Obama's campaign. A good portion of House members who have not declared their support are moderates and conservatives who represent swing districts dominated by small towns. Republicans, in particular, sought to use the remarks to put two politically-vulnerable Democratic House members on the hot seat. The targets of the National Republican Congressional Campaign Committee were a pair of freshman Pennsylvania Democrats - Jason Altmire, who represents small towns outside...