AN EMB145 FLC CROSSES THE HOLD LINE FOR RWY 32L WITHOUT CLRNC TO DO SO AT OMA; NE.

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AFTER HOLDING FOR MORE THAN 2 1/2 HRS AT THE RWY 32L PAD FOR TKOF; WE WERE ISSUED A CLRNC TO TAXI AND HOLD SHORT OF RWY 32L. WE STARTED TO TAXI TOWARDS THE RWY THINKING THAT INSTEAD WE HAD BEEN ISSUED A CLRNC TO TAXI INTO POS AND HOLD. AFTER XING THE HOLD SHORT LINE OFF THE RWY (APPROX 5 FT) THE FO AND MYSELF QUESTIONED EACH OTHER ABOUT THAT CLRNC; AND ASKED THE GND CTLR WHETHER WE HAD BEEN CLRED TO TAXI INTO POS OR NOT. HE ANSWERED; 'NO.' HE THEN ASKED US IF WE HAD CROSSED THE LINE AND WE TOLD HIM YES. WE WERE TOLD TO HOLD SHORT AND CONTACT TWR. ON TWR FREQ THE TWR CTLR ORDERED ANOTHER ACFT TO GO AROUND. HE WAS APPROX 3 MI TO 4 MI FINAL TO RWY 32L. WE WERE THEN CLRED FOR TKOF. LATER THAT NIGHT WE HAD TO RETURN TO OMA AS THE WX IN ORD DETERIORATED; AND AFTER PARKING THE ACFT I CALLED THE TWR AND SPOKE TO ONE OF THE CTLRS. WE DISCUSSED THE MATER FOR SEVERAL MINS AND WE BOTH AGREED ON BEING MORE CAREFUL; AND ABOVE ALL TO PAY CLOSE ATTN TO GND AND TWR CLRNCS IN THE FUTURE. THE FO AND MYSELF ALSO TALKED ABOUT THIS MATTER EXTENSIVELY AND AGREED TO WORK BETTER AS A TEAM AND PUT INTO PRACTICE OUR CRM. SUPPLEMENTAL INFO FROM ACN 469105: OUR FLT HAD BEEN RELEASED FROM OMA TO ORD AFTER A 1 HR 45 MINS GND HOLD DELAY. WE WERE GIVEN CLRNC FROM OMA GND CTL TO TAXI TO RWY 32L. AFTER RECEIVING CLRNC FROM GND CTL TO TAXI TO THE RWY; THE CAPT AND I WERE BUSY DOING OUR TAXI CHKLIST AND BECAUSE OF THE SHORT TAXI TO RWY 32L FROM OUR PARKED POS (RWY 32L HOLDING AREA) WE WERE STILL COMPLETING OUR CHKLIST UPON ARR AT THE RWY. BECAUSE OF THIS THE CAPT AND I HAD NOT COMMUNICATED EFFECTIVELY ABOUT GND CTL'S ORIGINAL TAXI CLRNC. BECAUSE I WAS BUSY COMPLETING TAXI CHKLIST ITEMS I WAS NOT POSITIVELY AWARE OF OUR POS RELATIVE TO THE RWY WHEN WE CROSSED THE HOLD SHORT LINE. CONTRIBUTING FACTORS: COM BTWN MYSELF AND THE CAPT REGARDING THE TAXI CLRNC. FAILURE ON MY PART TO REMAIN POSITIVELY AWARE OF OUR POS RELATIVE TO THE RWY. FAILURE OF THE CAPT TO CONFIRM (WITH ME) OUR TAXI CLRNC UPON ISSUE. NIGHTTIME DARK ENVIRONMENT. I CAN PERSONALLY HELP PREVENT FUTURE SUCH SITS BY ENSURING THE CAPT KNOWS EXACTLY WHAT THE ATC CLRNC IS.