US President Barack Obama has depicted the new Republican vice-presidential candidate Paul Ryan as the "ideological leader" of the Republican Party.
Mr Obama said Mr Ryan was a "decent" man - but with a vision "fundamentally" at odds with his own.
Thousands have turned out as Mr Ryan and Republican presidential candidate Mitt Romney tour key states.
Correspondents say the selection of Mr Ryan appears to have reinvigorated the Republican campaign.
Source: BBC. Read full article. (link)