John McLean
McLean received the support of delegates at the 1848 Whig National Convention , the 1856 Republican National Convention , and the 1860 Republican National Convention . 
<triplet> 1848 Whig National Convention <subj> 1848 <obj> point in time <triplet> 1856 Republican National Convention <subj> 1856 <obj> point in time <subj> 1860 Republican National Convention <obj> followed by <triplet> 1860 Republican National Convention <subj> 1860 <obj> point in time