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Replace the igniter. Even if it's glowing red hot, it is still likely the problem. Evidently the oven reads the resistance across the heating element, and when it doesn't detect enough resistance, it knows that the igniter is wearing out, thus not getting hot enough, and you're going to have a hard time igniting the gas. So, it won't turn on the gas -- how thoughtful of your oven to keep you from blowing up.
I had the same problem until I read all about it at
http://fixitnow.com/wp/2004/09/19/appliance-repair-revelation-troubleshooting-a-gas-oven-that-wont-fire-up/If you're in a bind and need to use your oven tonight (or you want proof that it's the igniter going bad), you can try stealing the igniter from the broiler and using it to replace the igniter for the main part of the oven. Since most people use the broiler less than the regular "bake" feature of the oven, that igniter lasts longer.