Chris Van Hollen, Jeff Flake

FILE - In this Dec. 17, 2014, file photo, Rep. Chris Van Hollen, D-Md., speaks as Sen. Jeff Flake, R-Ariz. listens during a news conference on Capitol Hill in Washington. Senate Minority Leader Harry Reid enthusiastically endorsed Van Hollen Friday, March 6 for the U.S. Senate, an early attempt by a key Democrat to clear the field and avoid a divisive primary campaign to replace Maryland's longtime Democratic incumbent Sen. Barbara Mikulski. (AP Photo/J. Scott Applewhite, File) ORG XMIT: WX112

J. Scott Applewhite / Associated Press
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