WATERLOO, Iowa (Reuters) - Rising Tea Party star Michele Bachmann leaped into the Republican 2012 presidential nomination race on Monday, saying the country cannot afford four more years of President Barack Obama's handling of the economy. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=Lixi54qQYPE:9ijg9_R57PE:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=Lixi54qQYPE:9ijg9_R57PE:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/Lixi54qQYPE)