By CHRISTOPHER RUGABER, AP Economics Writer WASHINGTON (AP) — U.S. home prices soared in April at the fastest pace since 2005 as potential buyers bid up prices on a limited supply of available properties. The S&P CoreLogic Case-Shiller 20-city home price index, released Tuesday, jumped nearly 15% in April from the previous year. That is up from a 13.4% annual gain in March. Many Americans have sought