Polls find Senators Landrieu & Hagan losing and Shaheen tied

A flurry of recent polls may offer some insights into key senate races. A Rasmussen poll finds Louisiana Senator Mary Landrieu trailing Congressman Bill Cassidy by by 4- 44% to 40%. Five percent favor someone else and 11% are undecided. For an incumbent to be at 40% portends a rugged struggle for re-election. Keep in mind Louisiana's jungle primary. All candidates run in the same primary and the top two pair off in the fall unless one candidate wins more than 50% in which case there is no fall election.
In North Carolina Senator Kay Hagan loses to two Republican in another Rasmussen poll. Thom Tillis, the Republican speaker of the state House of Representatives beats Hagan 47% to 40%. Tea Party favorite Dr. Greg Brannon beats Hagan 43% to 39%.
In New Hampshire two different polls, neither of which I am familiar, produce very divergent results. The WMUR Granite State Poll, conducted by the University of New Hampshire shows incumbent Senator Jeanne Shaheen beating former Massachusetts Senator Scot Brown by 10 points 47% to 37%. Another poll by Purple Strategies finds the same race tied at 44% each.