(AP) — Former President Bill Clinton described U.S. Sen. Mary Landrieu as one of the Senate's most bipartisan and effective lawmakers, offering a high-profile campaign boost Monday to the Democratic incumbent ahead of the start of Louisiana's early voting period. Clinton sought to combat GOP claims that Landrieu was too closely tied to Democratic leadership in Washington and didn't represent her home state's values. Landrieu's campaign hopes Clinton's star power and continued popularity help sway undecided voters and bolsters minority turnout in the Nov.