During the election season , McCain 's highest support among an average of national polls was 2.9 % on September 8 , four days after the end of the 2008 Republican National Convention . Amongst individual polls , before the primary season McCain 's highest support was recorded in a Fox News poll conducted between December 5 and December 6 showing a 19 % lead . After the primaries , McCain 's highest support was recorded in a USA Today/Gallup poll conducted between September 5 and September 7 showing a 10 % lead
2008 Republican National Convention
2008 Republican National Convention
John McCain 2008 presidential campaign