By Andy Sullivan WASHINGTON (Reuters) -One day before midterm elections that could usher in a new era of divided government in Washington, President Joe Biden and his predecessor Donald Trump will hold competing rallies in a final effort to mobilize supporters. Biden, whose sagging popularity has made him unwelcome in several swing states, will travel to reliably Democratic Maryland on Monday, where the Democratic gubernatorial nominee, Wes Moore, is widely expected to win back the Republican-held governorship. Trump, meanwhile, is headed to Ohio to campaign alongside the Republican Senate nom…