By Stephen Culp NEW YORK (Reuters) -U.S. stocks advanced on Tuesday, gaining momentum in morning trading while Treasury yields took a pause as Americans went to the polls and market participants bided their time to determine whether Capitol Hill is in for a power shift. The blue-chip Dow led Wall Street’s major slightly higher, while the greenback was essentially unchanged against a basket of world currencies. The result of the U.S. midterm election will decide whether Democrats lose or retain congressional control halfway through President Joe Biden’s first term in the oval office, raising th…