WITH the promotion of Rachel Maddow, the Air America radio host, to a prime-time television spot this week, the longtime third-place cable news network MSNBC cemented its identity as a channel for a liberal audience. But is that what advertisers...

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With the promotion of Rachel Maddow, the Air America radio host, to a prime-time television spot this week, the longtime third-place cable news network MSNBC cemented its identity as a channel for a liberal audience. But is that what advertisers...