Story in Left 4 Dead 2?

Does Left 4 Dead 2 have story mode(long campaign not just maps)?

Yes. The story in the campaign is: See zombie, kill zombie. Any questions?

Well, not really. There's not really a story going on in the game. However, the game does have different campaigns for co-op. So, it's not like you hop on to a server playing a specific map in other FPS games. A campaign in L4D2 is basically a series of maps. You get to the end of one, then you load up the next part.zomglolcats

Actually there is an overriding story there that involves the survivors starting out in Savannah and trying to get to New Orleans where they hope to be rescued.

From wikipedia: http://en.wikipedia.org/wiki/Left_4_Dead_2

After climbing a hotel in Savannah to achieve rescue, the survivors find themselves abandoned by helicopters, and make their way to the local mall after hearing word of a second evacuation point there ("Dead Center"). The mall proves to be overrun, and the four use a stock car to bust out of the mall and travel towards New Orleans. Finding the highway completely blocked by wrecked vehicles, the four are forced to travel through a still-operating amusement park, and start a huge fireworks-and-lights show in order to attract the attention of a helicopter pilot ("Dark Carnival"). Though rescued, they find their pilot to have been infected, and are forced to kill him, causing the helicopter to crash into a bayou ("Swamp Fever"). Finding brief shelter in a plantation mansion, they make radio contact with a boat captain named Virgil who rescues them, but informs them that he needs additional diesel fuel to make it to New Orleans. Amid a torrential downpour, the survivors go ashore, make their way to a gas station to get fuel supplies, and return and defend their position while waiting for the boat ("Hard Rain"). Virgil takes them to New Orleans, where the military appears to still be evacuating survivors, but as they make their way to the extraction point, they find that the military is actually bombing the city to cleanse the infection ("The Parish"). They are able to clear the bridge amid a mass of infected and reach safety, moments before the bridge is demolished.