On the second day of his tour of Southern California, President Obama highlighted his environmental jobs agenda with a visit to an electric-vehicle testing facility in Pomona, where he announced a $2.4-billion competitive grant program to make the electric vehicles more widely available. As a receptive audience of engineers and workers cheered his plans, Obama pledged to put a million plug-in hybrid vehicles on the road by 2015, and highlighted his offer of up to $7,500 in tax credits for Americans who purchase electric vehicles.