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 ObamaHow the candidates for DNC chair stack up ahead of Saturday's vote Ginsburg: Trump Supreme Court nominee Neil Gorsuch is 'very easy to get along with' Ivanka, Kushner pushed to strike climate deal criticism from executive order: report MORE (D-Ill.) and Hillary ClintonHillary Rodham ClintonConquering Trump returns to conservative summit How the candidates for DNC chair stack up ahead of Saturday's vote DNI official challenges reports of low morale in intelligence community MORE (D-N.Y.).

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