US presidential candidate Kamala Harris is ahead of her opponent Donald Trump in three key states. The winner of the election often depends on them, according to The New York Times. New polls in Michigan, Wisconsin, and Pennsylvania conducted this week show a sharp change in the Democratic Party’s position after US President Joe Biden refused to seek re-election. Harris leads Trump by four percentage points in Wisconsin, Pennsylvania, and Michigan, 50 to 46 percent among likely voters in each state. The surveys were conducted from 5 to 9 August. The polls, some of the first high-quality pollin…