WASHINGTON — House Republicans unexpectedly pledged an immediate review of President Barack Obama’s jobs proposals on Friday as he launched a public campaign for urgent passage of his day-old $447 billion program of tax cuts and new spending.

“Nothing radical in this bill,” Obama told a large crowd at the University of Richmond on the afternoon after his dramatic speech to Congress.

Obama’s contentions are unlikely to go unchallenged by Republicans, who have worked without letup for months to cut spending rather than increase it. But he had barely completed his remarks when Speaker John Boehner and other top House GOP leaders released their letter to him declaring “our desire to work with you to find common ground.”

With unemployment at 9.1 percent, they wrote that while their own proposals may differ from Obama’s “we believe your ideas merit consideration by the Congress and believe the American people expect them to be given such consideration.”