Pennsylvania Democrats have registered in record numbers for the state's April 22 primary following a late surge to Monday's deadline. The last minute rush put the total number over 4 million, a 4 percent bump over both 2006 and 2004 at this point in the cycle. GOP registration declined slightly over the last 2 cycles.

Over 120,000 Democrats have registered for the first time since Jan. 1. An additional 86,000 switched their party affiliation from either Independent or Republican.

At first look, a break down by county shows the bump spans accross the state to areas of strength for both Sens. Barack ObamaBarack ObamaThe resistance is working as Republicans pull healthcare bill Gorsuch has moderate record on immigration: analysis Why ObamaCare is the perfect prescription for prison reform MORE (D-Ill.) and Hillary ClintonHillary Rodham ClintonCheney: Russian election interference could be ‘act of war’ Conservatism's worst enemy? The Freedom Caucus. The Hill's 12:30 Report MORE (D-N.Y.).

Recent polls show Clinton's lead over Obama anywhere from 12 to 26 points.