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FILE - In this Feb. 29, 2012, file photo Republican Sen. Lisa Murkowski, R-Alaska, talks Republican Senators, from left, John Hoeven, R-N.D., John Thune, R-S.D., and Sen. John Cornyn, R-Texas, prior to a news conference on gas prices on Capitol Hill in Washington. Murkowski, 54, a moderate in an era of paralyzing partisanship, may be a natural heir to the centrist role played by retiring Maine Sen. Olympia Snowe at a time when their party is hurting for female leaders. (AP Photo/Jacquelyn Martin, File)

Associated Press
FILE - In this Feb. 29, 2012, file photo Republican Sen. Lisa Murkowski, R-Alaska, talks Republican Senators, from left, John Hoeven, R-N.D., John Thune, R-S.D., and Sen. John Cornyn, R-Texas, prior to a news conference on gas prices on Capitol Hill in Washington. Murkowski, 54, a moderate in an era of paralyzing partisanship, may be a natural heir to the centrist role played by retiring Maine Sen. Olympia Snowe at a time when their party is hurting for female leaders. (AP Photo/Jacquelyn Martin, File)
FILE - In this Feb. 29, 2012, file photo Republican Sen. Lisa Murkowski, R-Alaska, talks Republican Senators, from left, John Hoeven, R-N.D., John Thune, R-S.D., and Sen. John Cornyn, R-Texas, prior to a news conference on gas prices on Capitol Hill in Washington. Murkowski, 54, a moderate in an era of paralyzing partisanship, may be a natural heir to the centrist role played by retiring Maine Sen. Olympia Snowe at a time when their party is hurting for female leaders. (AP Photo/Jacquelyn Martin, File)
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