Ten closely contested Senate races could determine which party controls the chamber for the final two years of President Donald Trump's term. Democrats need to gain at least four seats to reclaim the majority, while Republicans are defending a six-seat edge in a difficult political environment for the White House. Recent public polling shows Democrats ahead in Alaska, Georgia, Maine, Michigan, North Carolina, Ohio and Texas, while Republicans lead in Iowa, Nebraska and New Hampshire. Several margins fall within typical polling error ranges, and the Texas race between Democrat Talarico and Republican Paxton is effectively tied. Democrats have recently improved their position in national polls, but Republicans remain competitive in states with substantial numbers of undecided voters. With early voting underway in Virginia, both parties are expected to spend millions of dollars on advertising, voter outreach and turnout operations before Nov. 3. The Senate outcome could affect judicial confirmations, executive appointments and the administration's legislative agenda. The latest polling leaves control of the chamber unresolved, with a small group of close races likely to determine the balance of power in Washington after Election Day.