How do you beat this mission? It's the one where you drive the rogue cop to the airport. The guys on the bridge destroy me in about 2 seconds. When I snipe them, more apear out of nowhere. Please help!

Well get a fast car for one (police, banshee or cheetah). Then park it right where you go and talk to Ray. After the cinematic is over you run to the car and let him get in of course. But instead of taking the main road take the subway. Yeah it seems strange but the subway is the best route to take. The subway enterance is in the area of Staunton Island by the hospital (respawn area) and Liberty Campus. Look for it first before the mission if you don't know where the exact location is. Once at the subway with Ray in your car go all the way down to where the subway tracks are. Turn right on the tracks and go as fast as you can. If you take the right route you'll end up at the fountain by the airport in Shoreside Vale. Easy access to the end of the mission from there.