Watch the Country Rock: Rhythm 1 online guitar lesson by Joe Dalton from Big Twang

The roots of this can be tracked back to Chuck Berry. If you start with the Johnny B. Goode rhythm guitar part, add some drive with the pick, stir in a little syncopation and mix in some double stops with the middle and ring fingers then simmer over a blues progression, you have cooked yourself up some contemporary country rock electric rhythm guitar.
Listen to Brooks and Dunn's "Hard Working Man". You can hear this type of playing on many different recordings.