Biden is Trump's most anticipated and feared rival
by from CNN.com - RSS Channel - App International Edition on (#4DXDF)
He's the Democratic candidate President Donald Trump has long worried would emerge as his general election rival. Now, with the entry of former Vice President Joe Biden into a crowded primary field, a race that once seemed to Trump like abstract chatter has sharpened into a concrete proving ground that will challenge his hold on the nation's political spotlight.