Mexican mayor slain in drug-plagued state

Drug cartels are killing off political figures in Mexico to gain control of drug trade routes and territories.  I think this poses a much higher threat to America as Mexico becomes more unregulated and in control of the cartels it opens the door to terrorists and anti American groups.  Cartels are taking over the government there by killing officials or just the threat of killing them or their families.  The use should be using more of its power to help out Mexico they have a higher threat to us due to their close proximity.  We are doing some work there but not enough there is no US military there only DEA and some other agencies.  The US could also help by legalizing marijuana and stopping the international drug trade.  Marijuana is their biggest cash crop if drug trade was hit due to domestic growth it would cripple the cartels. 
Ed Barry
http://news.yahoo.com/s/ap/20100924/ap_on_re_la_am_ca/lt_drug_war_mexico