Interrupt Debounce

I am trying to write a simple button interrupt debounce routine without much success.  I am seeing unexpected interrupts occurring.  

The logic I am using is to disable the button interrupt when first pressed and then re-enabling it when the watch dog timer expires.  I have tried increasing the wdt interval but the momentary switch button is still bouncing and simply fires the button interrupt unexpectedly.

I know I can write other debounce routines but I would like to stay out of polling or looping for low power reasons if at all possible.  I am not sure if the issue is something with the wdt so I am also looking at using timerA instead of the wdt.

Thanks for any guidance/suggestions.

#include <msp430g2553.h>

#define     BUTTON                BIT3 //0x08

int main(void) {
	WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer

	P1REN |= BUTTON; // enable pull up resistor on P1.3 button
	P1DIR |= 0x01; // Set P1.0 to output direction
	P1IE |= BUTTON; // P1.3 interrupt enabled
	P1IES |= BUTTON; // P1.3 Hi/lo edge
	P1IFG &= ~BUTTON; // P1.3 IFG cleared - set to correct state first time

	__enable_interrupt(); // enable all interrupts

	while(1)
	{
		//check flags set by interrupts here, do something, clear flag
	}

	//return 0;
}

// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
	//__bic_SR_register_on_exit(LPM4_bits); // clear original LPM4 Bit to wake up clocks and cpu
	P1IFG &= ~BUTTON;                 // Clear the interrupt flag for the button
	P1IE &= ~BUTTON;                  // Disable Button interrupt
	//WDTCTL = WDT_MDLY_32;             // Set watchdog timer (WDT) to trigger every 32ms
	WDTCTL = WDT_ADLY_1000;
	IE1 |= WDTIE;                     // enable WDT interrupt

	P1OUT ^= 0x01; // P1.0 = toggle (toggle led)
}

// WDT Interrupt Service Routine used to de-bounce button press
#pragma vector=WDT_VECTOR
__interrupt void WDT_ISR(void)
{
    IE1 &= ~WDTIE;                   // disable Watchdog timer (WDT) interrupt
    IFG1 &= ~WDTIFG;                 // clear WDT interrupt flag
    WDTCTL = WDTPW + WDTHOLD;        // put WDT back in hold state
    P1IE |= BUTTON;                  // Reenable interrupts for the button
}