Washington ( CNN ) -- With less than a month until Election Day , Sen. Mary Landrieu is changing her reelection campaign 's leadership . The Louisiana Democrat shook up her campaign staff , bringing in a new campaign manager and calling up former and current Senate staffers to help her beat back challenges from two Republicans in the state 's jungle primary-style election , the New Orleans Times-Picayune first reported Wednesday . The changes come as Landrieu faces slimming odds that she will win 50 % of votes to avoid a runoff election . Ryan Berni , who ran her brother New Orleans Mayor Mitch Landrieu 's reelection campaign earlier this year , is now leading the reelection bid , and Landrieu also rang her former chief of staff Norma Jane Sabiston to advise the campaign . Current campaign manager Adam Sullivan will stay on as a senior adviser to the campaign . Landrieu campaign spokesman Fabien Levy would not say why specifically Sullivan was replaced . `` As Senator Landrieu has done in all of her races , she is bringing on some of her long-time and trusted advisers to assist during the last month of the race to lead us to victory on November 4. , '' Landrieu campaign spokesman Fabien Levy told CNN in an email . Senator reimburses federal government more than $ 30,000 in travel . Two Landrieu Senate staffers , her state director and Washington communications director , are also taking leaves of absence to bolster their boss 's campaign . Landrieu has faced an uphill climb in her reelection bid this year and the challenge for her new staff will be to help Landrieu crack the 50 % threshold needed to avoid a December runoff . That seems unlikely according to the latest CNN/ORC poll , that showed her support stood at 43 % , with Rep. Bill Cassidy coming in a close second with 40 % . A runoff election between the two could favor Cassidy , who would be able to regain votes lost to the third candidate , tea party Republican Rob Maness . That election would be close though , with the CNN/ORC poll giving Cassidy just a 3-point lead in an eventual runoff with the incumbent Senator . Congressman : Reid runs the Senate 'like a plantation '
Landrieu 's new campaign manager Mary Murphy also managed her husband 's mayoral reelection campaign . Current campaign manager John Murphy will stay on to advise the campaign . In the latest CNN / ORC poll , Landrieu seems unlikely to avoid a December runoff .