It would hardly shock anyone in television that the place to find registered Republican voters is on the Fox News channel — just as MSNBC qualifies as a home base for Democratic voters.

But in a finding that tracks the general Republican animus toward broadcast network news (often ascribed to a pivotal role in the “lame-stream media” by conservative critics), a study of cable television subscribers indicates that each of the network evening newscasts has audiences that skew significantly Democratic.

The information comes from TRA Inc., which stands for TiVo Research and Analytics – TiVo is the television set-top box provider that pioneered the use of the digital video recorder. The results are based on an analysis gleaned from matching viewing data from those boxes and anonymous voter-registration records. (These are publicly available.)

The overall sample involved was huge, 2.2 million television households. TRA was able to match viewing habits of households headed by an adult 35 years or older to voter registrations for 186,846 homes. The viewing was measured in the first two quarters of the year.

The findings were compared with a base of all registered voters. If the sample matched those figures exactly it would show an index of 100 percent. Given the size of the sample, Terese Herbig, the senior vice president for sales and marketing at TRA, said that any index of 110 percent or higher would be considered a large skew.

By that standard, the 144 Republican index for Fox News and the 143 Democratic index for MSNBC are enormous skews. In other words, the Fox News audience is tilted Republican by 44 percent above the base of registered voters nationwide. The number for MSNBC is almost the same for Democratic voters, a 43 percent skew. (In each case the networks are watched by the opposing party loyalists in tiny numbers: Fox’s index of Democrats is just 79; MSNBC’s for Republicans is even punier, 65.)

CNN, which has branded itself as the cable news network without a partisan skew, has apparently made the sale among independent voters. The network’s biggest skew was among independents, 17 percent above the national average with that group. But CNN also scored 11 percent above the baseline with registered Democrats. Republicans watch CNN in fewer numbers: 8 percent below the base number.

Perhaps the most interesting results came in the indices for network newscasts. ABC’s program, for example, is much more a favorite of Democrats than Republicans. The index of registered Democrats for ABC’s newscast is 114 — 14 percent above the baseline for registered voters. The index for Republican voters was 98, two percentage points below that base.

For the “NBC Nightly News,” the breakdown is also significantly more toward Democratic viewers, with an index of 112 with that group. The index for Republican viewers was 99, just below the baseline.

CBS’s evening newscast had the most balanced audience. The program scored 10 percent above the average with Democratic voters, but it was also 3 percent over the baseline with Republican voters, and exactly on the line, an index of 100, with Independent voters.