Good luck with that...
List of most-listened-to radio programs
http://en.wikipedia.org/wiki/List_of_most-listened-to_radio_programs
#1 The Rush Limbaugh Show Conservative talk Midday 14+ Million
Huckabee isn’t even on the list... so, what’s this business of saying he has 50% of Rush Limbaugh’s audience?
Talkers Magazine compiles Arbitron's data, along with other sources, to estimate the minimum weekly audiences of various commercial long-form talk radio shows.[8] NPR and APM compile Arbitron's data for its public radio shows and releases analysis through press releases.[7][9][10][11][12]
| Program | Format | Daypart | Weekly Listeners in Millions |
|---|---|---|---|
| The Rush Limbaugh Show | Conservative talk | Midday | 14+ |
| The Sean Hannity Show | Conservative talk | East Coast PM Drive | 13.25+ |
| Morning Edition | Public news | AM Drive | 12.3[13] |
| All Things Considered | Public news/talk | PM Drive | 11.8[13] |
| Marketplace | Public news | PM Drive | 9+ |
| Delilah | Adult contemporary | Evenings | 8+ |
| The Dave Ramsey Show | Financial talk | Midday | 7.75+ |
| Glenn Beck Program | Conservative talk | West Coast AM Drive | 7.5+ |
| The Mark Levin Show | Conservative talk | West Coast PM Drive | 7.5+ |
| Fresh Air | Public news/talk | Midday | 4.5[14] |
| A Prairie Home Companion | Public old-time radio | Weekends | 4+ |
| Coast to Coast AM | Paranormal talk | Overnights | 3.5+ |
| Talk of the Nation | Public talk | Midday | 3.2[14] |
| Wait Wait... Don't Tell Me! | Public panel game show | Weekends | 3.2[15] |
| After MidNite with Blair Garner | Country music | Overnights | 2.7 |
| The Lia Show | Country music | Evenings | 2+[16] |
Note on dayparts: because of the effects of time on North American broadcasting, nationally syndicated shows that air live will end up on different dayparts in different time zones. The above list makes note of this. Note that although shows such as Beck's and Levin's are listed under "West Coast" drive times, that their shows are based on the East Coast (and thus air in early midday and early evening time slots there). Their dayparts are indicated as such for the purposes of clarity and consistency.
The list is heavily skewed toward conservative talk radio and public radio due to the greater availability of data for those formats; other formats, particularly those for music, are not measured in as much detail, in part due to irregularities in scheduling.