Beginning Findings

All of these I found on caglecartoons.com and searching under same-sex marriage

editorialcartoonist.com:

http://editorialcartoonists.com/cartoon/display.cfm/64562/

http://editorialcartoonists.com/cartoon/display.cfm/63515/

http://editorialcartoonists.com/cartoon/display.cfm/63231/

http://editorialcartoonists.com/cartoon/display.cfm/62855/

http://editorialcartoonists.com/cartoon/display.cfm/62578/

http://editorialcartoonists.com/cartoon/display.cfm/62448/

http://editorialcartoonists.com/cartoon/display.cfm/62321/

http://editorialcartoonists.com/cartoon/display.cfm/61423/

http://editorialcartoonists.com/cartoon/display.cfm/78029/

http://editorialcartoonists.com/cartoon/display.cfm/70997/

http://editorialcartoonists.com/cartoon/display.cfm/70039/

http://editorialcartoonists.com/cartoon/display.cfm/69443/

http://editorialcartoonists.com/cartoon/display.cfm/69189/

http://editorialcartoonists.com/cartoon/display.cfm/69037/

http://editorialcartoonists.com/cartoon/display.cfm/68955/

http://editorialcartoonists.com/cartoon/display.cfm/90001/

http://editorialcartoonists.com/cartoon/display.cfm/89405/

http://editorialcartoonists.com/cartoon/display.cfm/89409/

http://editorialcartoonists.com/cartoon/display.cfm/89309/

http://editorialcartoonists.com/cartoon/display.cfm/89089/

http://editorialcartoonists.com/cartoon/display.cfm/89069/