WASHINGTON (Reuters) - Economic fears are weighing heavily on Americans, with a large majority saying the United States is on the wrong track and nearly half believing the worst is yet to come, a Reuters/Ipsos poll said Wednesday. The poll reflected growing anxiety about the US economy and frustration with Washington after a narrowly averted government default last week, a credit rating downgrade by Standard & Poor's, a stock market dive and a stubbornly high 9.1 percent jobless rate. President Barack Obama was politically bruised in the brutal, weeks-long debt debate, and negative views on the economy are worrisome signs for his 2012 re-election bid. His approval rating dropped to 45 percent from 49 percent a month ago, according to the poll conducted from Thursday to Monday.