With the battle to become the next U.S. senator from California heating up, a clear frontrunner has a grip on the race, according to recent polling. The UC Berkeley Institute of Governmental Studies poll, which was co-sponsored and published by the Los Angeles Times, showed that U.S. Rep. Adam Schiff (D-Burbank) holds majority support among likely voters in November's election. The poll said Schiff was the preferred candidate of 53% of likely vo…