The 50-49 vote on the budget could spell the most trouble for gun control legislation, which is next on the Senate docket.Democrats have struggled to unify behind gun legislation, and budget defectors Sens. Mark Pryor (Ark.), Kay Hagan (N.C.), Mark Begich (Alaska) and Baucus all hail from states where restrictions on firearms are unpopular. Already, Democrats from conservative states are pushing back on television ads financed by New York Mayor Michael Bloomberg (I) that urge them to support a universal background check system for gun purchases.

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