The idea mentioned in Atel's article that this sentence supports is that more of the American public is accessing the State of the Union through newer technology.
It should be noted that the central idea simply means the main idea that's conveyed by the author in a literary work.
From the information, it was stated that fewer Americans are watching the address via live television, but it still influences American voters and public discourse.
This illustrates that despite the fact that people aren't watching through traditional means, the new firms of technology are used nowadays. This helps to convey the information about the importance of the newer forms of technology.
In this case, the idea mentioned in Atel's article that this sentence supports is that more of the American public is accessing the State of the Union through newer technology. This was illustrated based on the information given.
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