By Chris Kahn NEW YORK (Reuters) -More than half of Americans approve of President Joe Biden after nearly 100 days on the job, according to Reuters/Ipsos polling, a level of support that his Republican predecessor Donald Trump never achieved and one that should help Democrats push for infrastructure spending and other big-ticket items on Biden's agenda. The national opinion poll of 4,423 adults from April 12-16 found that 55 percent approved of Biden's performance in office, while 40 percent 4disapproved and the rest were not sure. Biden received the highest marks for his handling of the coronavirus pandemic...