wheelhorse (?.)

• Conservative
• Democrat
• Labourite
• Republican
• Tammany man
• Tory
• Whig
• bidet
• carriage horse
• cart horse
• cavalry horse
• draft horse
• dray horse
• driving horse
• fill horse
• filler
• gigster
• hack
• hackney
• heeler
• hunter
• jument
• lead
• leader
• loyalist
• machine politician
• mount
• old campaigner
• pack horse
• palfrey
• partisan
• party boss
• party chieftain
• party faithful
• party hack
• party leader
• party man
• party member
• party wheelhorse
• plow horse
• pol
• pole horse
• political hack
• political leader
• politician
• polo pony
• post-horse
• professional politician
• reform politician
• reformer
• registered Democrat
• registered Republican
• regular
• remount
• rider
• riding horse
• road horse
• roadster
• rouncy
• saddle horse
• saddler
• shaft horse
• stalking-horse
• stalwart
• sumpter
• sumpter horse
• thill horse
• thiller
• war-horse
• ward heeler
• wheeler
• workhorse