WASHINGTON — A Republican-leaning group will begin airing a major advertisement this week critical of the Obama administration's investment into a now-defunct solar-energy company, The Associated Press has learned. Crossroads GPS will spend $500,000 on three cable network ads that hit President Barack Obama for "crony" government spending in his administration's half-billion-dollar loan guarantee to Solyndra. The Fremont, Calif.-based solar-panel maker filed for Chapter 11 bankruptcy protection in September and was the first renewable-energy company to receive a loan under a stimulus-law program to encourage green energy. The "nationwide ad by Crossroads GPS is aimed at exposing this ugly underbelly of Obama's vision," according to a memo from Crossroads president Steven Law.