Every vulnerable Senate Democrat up for re-election in 2014 voted with President Barack Obama at least 90 percent of the time in 2013, according to CQ Roll Call's latest vote studies , released Monday.
Arkansas Democrat Mark Pryor broke with the president most often, opposing him in 10 percent of all 2013 votes where the administration stated a preferred outcome. Sens. Mark Begich, D-Alaska, Mary Landrieu, D-La. and Kay Hagan, D-N.C., voted for Obama's position 97, 97, and 96 percent of the time, respectively. Of those four, only Begich serves with a Republican who has bucked the GOP to back Obama with any frequency. (See our Jan. 21 story .)